I had underextrusion problems after the 2nd week of my purshase (UM2).
I kept printing at least 10h/day since day one and had zero problem.
Two days ago, first underextrusion problems. I thought it was due to ambiant temperature .I had my window open during printing time and it was very cod outside. Naturally, i tried the same pieces but with my window closed and a steady temperature. Still had underextrusion...
Printing parameter:
Layer: 0.1mm
print speed : 80mm/s
Temperature of extrusion: 210°C (PLA from makershop)
Every thing else default settings
Found out this topic and the one about the Atomic Method.
I tried the test and it started skiping layers after the 4mm3/s mark... (i died a little inside when it happened)
I did the Atomic method a couple of time and tried the test a second time.
It started skipping at the 6mm3/s mark. Better but still a fail.
One more Atomic method cleaning method with a new PLA (The white Ultimaker one, barely used). New test. but this time at 230°C. Awesome result. No skipping all the way up! Boomshakalaka!
Changed back to the PLA i started with... still at 230°C. Got to the 8mm3/s and it got messed up again.
I suspect the coil of the makershop spool being responsible for that. It is smaller in diameter compared with the other spool so the coil is more important and must put too much pressure when the filament is moving in the bowden tube.
Plus, the actual spool i was using was half way through so the coil started to be pretty important.
If anyone could back me up on this one, that would be greatly appreciated.
I hope this could help people with the same kind of problems.
Anyway, thanks for the help i found here!
EDIT from StarJeff: After closer examination of the bowden tube, i found a fine strand of material that could have been responsible for the previous failed test. I removed it and started a print before i went to work. I hope it'll turn out good.